9x²-( )=(3x+2x+2y)(3x-2x-2y)只待一个括号
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![9x²-( )=(3x+2x+2y)(3x-2x-2y)只待一个括号](/uploads/image/z/582927-15-7.jpg?t=9x%26%23178%3B-%EF%BC%88+%EF%BC%89%3D%EF%BC%883x%2B2x%2B2y%EF%BC%89%EF%BC%883x-2x-2y%EF%BC%89%E5%8F%AA%E5%BE%85%E4%B8%80%E4%B8%AA%E6%8B%AC%E5%8F%B7)
9x²-( )=(3x+2x+2y)(3x-2x-2y)只待一个括号
9x²-( )=(3x+2x+2y)(3x-2x-2y)
只待一个括号
9x²-( )=(3x+2x+2y)(3x-2x-2y)只待一个括号
9x²-(2x+2y)²=(3x+2x+2y)(3x-2x-2y)
9x²-(4(x+y)² )=(3x+2x+2y)(3x-2x-2y)
9x²-( 2x+2y)^2=(3x+2x+2y)(3x-2x-2y)
9x²-(4x²+4y² )=(3x+2x+2y)(3x-2x-2y)